FEATURE: How to Apply Fungicide to Tomato Plants: FAQs

Image: Edward Sikora, Auburn University Extension

To keep your tomatoes healthy, thriving, and fungus-free, you can apply fungicide before any symptoms appear. Set up an anti-fungal treatment program and implement it early in the season and then continue treatment throughout the season.

Applying Fungicide to Tomatoes: FAQs

Q. How do I know if I should use fungicide on my tomato plants?
A. If you know your garden (or your neighbor’s garden) has a history of early blight, late blight, or Septoria leaf spot, then your plants are vulnerable. Use a spray program. Q.
When should I start applying fungicide?
A. Begin before symptoms appear, especially if your plants have had tomato fungus in the past or if you live in warm, humid areas where early blight, late blight, and Septoria leaf spot thrive. You can begin as soon as you set plants in the garden. Q. What parts of the plant should I spray?
A. Spray upper and lower leaf surfaces, stems, and flowers. Q. How much should I spray?
A. Thorough coverage is essential. Spray to the point of runoff.